Canon EOS-7D - About the Lens Image Stabilizer

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When you use the IS lens’ built-in Image Stabilizer, camera shake is
corrected to obtain a less blurred shot. The procedure explained here is
based on the EF-S 15-85mm f/3.5-5.6 IS USM lens as an example.
* IS stands for Image Stabilizer.
1
Set the IS switch to <1>.
 Set the camera’s power switch to
<1>.
2
Press the shutter button halfway.
 The Image Stabilizer will operate.
3
Take the picture.
 When the picture looks steady in the
viewfinder, press the shutter button
completely to take the picture.
About the Lens Image Stabilizer
 The Image Stabilizer is not effective for moving subjects.
 The Image Stabilizer may not be effective for excessive shaking such as
on a rocking boat.
 With the EF 28-135mm f/3.5-5.6 IS USM lens, the Image Stabilizer will
not be very effective while you move the camera to take panned shots.
 The Image Stabilizer can operate with the lens focus mode switch set to
either <AF> or <MF>.
 If the camera is mounted on a tripod, you can save battery power by
switching the IS switch to <2>.
 The Image Stabilizer can operate even when the camera is mounted on
a monopod.
 Some IS lenses enable you to switch the IS mode manually to suit the
shooting conditions. However, the EF-S 15-85mm f/3.5-5.6 IS USM,
EF-S 18-135mm f/3.5-5.6 IS, and EF-S 18-200mm f/3.5-5.6 IS lenses
switch the IS mode automatically.